Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 733 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🦾 A servo program runs:
   angle = 60
   angle = angle + 20
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
3. 3.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
4. 4.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
5. 5.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 40. What is under the sensor? (a) the white floor (b) the black line
6. 6.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
7. 7.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False
8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
10. 10.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points left
12. 12.🧭 A robot spins 15° every second. How many seconds does it take to turn 30°?
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.🧭 A robot faces south. It does: turn around, turn left, turn right, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
18. 18.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) sound too high to hear (d) bright light
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 30. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) stays still (c) spins right on the spot (d) turns right
23. 23.🧭 A robot faces south. It does: turn right, turn right, turn around, turn left. Which way does it face now? (a) east (b) west (c) north (d) south
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
25. 25.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
27. 27.Which of these suits wheels? (a) loose sand dunes (b) deep mud (c) a smooth classroom floor (d) a field of tall boulders
28. 28.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 100° (d) 360°
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
30. 30.Which of these suits propellers? (a) flying over a field (b) a field of tall boulders (c) crossing stepping-stones (d) a smooth classroom floor
31. 31.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
33. 33.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
34. 34.⚙️ A motor makes 60 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
37. 37.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
39. 39.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
40. 40.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a touch sensor (c) a temperature sensor (d) a light sensor

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids